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OTDefaultAudioDevice.m
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OTDefaultAudioDevice.m
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//
// OTDefaultAudioDevice.m
//
// Copyright (c) 2014 TokBox, Inc. All rights reserved.
//
#import "OTDefaultAudioDevice.h"
#import <AudioToolbox/AudioToolbox.h>
#import <AVFoundation/AVFoundation.h>
#include <mach/mach.h>
#include <mach/mach_time.h>
/*
* System Versioning Preprocessor Macros
*/
#define SYSTEM_VERSION_EQUAL_TO(v) \
([[[UIDevice currentDevice] systemVersion] compare:v \
options:NSNumericSearch] == NSOrderedSame)
#define SYSTEM_VERSION_GREATER_THAN(v) \
([[[UIDevice currentDevice] systemVersion] compare:v \
options:NSNumericSearch] == NSOrderedDescending)
#define SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(v) \
([[[UIDevice currentDevice] systemVersion] compare:v \
options:NSNumericSearch] != NSOrderedAscending)
#define SYSTEM_VERSION_LESS_THAN(v) \
([[[UIDevice currentDevice] systemVersion] compare:v \
options:NSNumericSearch] == NSOrderedAscending)
#define SYSTEM_VERSION_LESS_THAN_OR_EQUAL_TO(v) \
([[[UIDevice currentDevice] systemVersion] compare:v \
options:NSNumericSearch] != NSOrderedDescending)
#define kMixerInputBusCount 2
#define kOutputBus 0
#define kInputBus 1
// Simulator *must* run at 44.1 kHz in order to function properly.
#if (TARGET_IPHONE_SIMULATOR)
#define kSampleRate 44100
#else
#define kSampleRate 16000
#endif
static mach_timebase_info_data_t info;
static const UInt32 kMixerBusCount = kMixerInputBusCount;
static const UInt32 kMicBus = 0;
static const UInt32 kMixerStreamInStart = 1;
static OSStatus recording_cb(void *ref_con,
AudioUnitRenderActionFlags *action_flags,
const AudioTimeStamp *time_stamp,
UInt32 bus_num,
UInt32 num_frames,
AudioBufferList *data);
static OSStatus playout_cb(void *ref_con,
AudioUnitRenderActionFlags *action_flags,
const AudioTimeStamp *time_stamp,
UInt32 bus_num,
UInt32 num_frames,
AudioBufferList *data);
static void print_error(const char* error, OSStatus code);
@interface OTDefaultAudioDevice ()
- (BOOL) setupAudioForGraph:(AUGraph *)au_graph playout:(BOOL)isPlayout;
- (void) setupListenerBlocks;
@end
@implementation OTDefaultAudioDevice
{
OTAudioFormat *_audioFormat;
AudioUnit recording_voice_unit;
AudioUnit playout_voice_unit;
BOOL playing;
BOOL playout_initialized;
BOOL playout_muted;
BOOL recording;
BOOL recording_initialized;
BOOL interrupted_playback;
NSString* avAudioSessionCatigory;
NSString* avAudioSessionMode;
double avAudioSessionPreffSampleRate;
NSInteger avAudioSessionChannels;
BOOL isAudioSessionSetup;
BOOL isRecorderInterrupted;
BOOL isPlayerInterrupted;
BOOL areListenerBlocksSetup;
@public
id _audioBus;
AudioBufferList *buffer_list;
uint32_t buffer_list_size;
AudioStreamBasicDescription stream_format;
AUGraph au_record_graph;
AUGraph au_play_graph;
uint32_t _recordingDelay;
uint32_t _playoutDelay;
uint32_t _playoutDelayMeasurementCounter;
uint32_t _recordingDelayHWAndOS;
uint32_t _recordingDelayMeasurementCounter;
Float64 _playout_AudioUnitProperty_Latency;
Float64 _recording_AudioUnitProperty_Latency;
}
#pragma mark - OTAudioDeviceImplementation
- (instancetype)init
{
self = [super init];
if (self) {
_audioFormat = [[OTAudioFormat alloc] init];
_audioFormat.sampleRate = kSampleRate;
_audioFormat.numChannels = 1;
}
return self;
}
- (BOOL)setAudioBus:(id<OTAudioBus>)audioBus
{
_audioBus = audioBus;
_audioFormat = [[OTAudioFormat alloc] init];
_audioFormat.sampleRate = kSampleRate;
_audioFormat.numChannels = 1;
return YES;
}
- (void)setAudioPlayoutMute:(BOOL)mute
{
playout_muted = mute;
}
- (BOOL)isAudioPlayoutMuted
{
return playout_muted;
}
- (void)dealloc
{
[self removeObservers];
[self teardownAudio];
_audioFormat = nil;
}
- (OTAudioFormat*)captureFormat
{
return _audioFormat;
}
- (OTAudioFormat*)renderFormat
{
return _audioFormat;
}
- (BOOL)renderingIsAvailable
{
return YES;
}
- (BOOL)initializeRendering
{
if (playing) {
return NO;
}
if (playout_initialized) {
return YES;
}
playout_initialized = true;
return YES;
}
- (BOOL)renderingIsInitialized
{
return playout_initialized;
}
- (BOOL)captureIsAvailable
{
return YES;
}
- (BOOL)initializeCapture
{
if (recording) {
return NO;
}
if (recording_initialized) {
return YES;
}
recording_initialized = true;
return YES;
}
- (BOOL)captureIsInitialized
{
return recording_initialized;
}
- (BOOL)startRendering
{
if (playing) {
return YES;
}
playing = YES;
if (NO == [self setupAudioForGraph:&au_play_graph playout:YES]) {
print_error("Failed to create play AUGraph",0);
playing = NO;
return NO;
}
OSStatus result = AUGraphStart(au_play_graph);
if (noErr != result) {
print_error("AUGraphStart", result);
playing = NO;
}
return playing;
}
- (BOOL)stopRendering
{
if (!playing) {
return YES;
}
playing = NO;
OSStatus result = AUGraphStop(au_play_graph);
if (noErr != result) {
print_error("AUGraphStop", result);
return NO;
}
// publisher is already closed
if (!recording && !isPlayerInterrupted)
{
[self teardownAudio];
}
return YES;
}
- (BOOL)isRendering
{
return playing;
}
- (BOOL)startCapture
{
if (recording) {
return YES;
}
recording = YES;
if (NO == [self setupAudioForGraph:&au_record_graph playout:NO]) {
print_error("Failed to create record AUGraph",0);
recording = NO;
return NO;
}
OSStatus result = AUGraphStart(au_record_graph);
if (noErr != result) {
print_error("AUGraphStart", result);
recording = NO;
}
return recording;
}
- (BOOL)stopCapture
{
if (!recording) {
return YES;
}
recording = NO;
OSStatus result = AUGraphStop(au_record_graph);
if (noErr != result) {
print_error("AUGraphStop", result);
return NO;
}
[self freeupAudioBuffers];
// subscriber is already closed
if (!playing && !isRecorderInterrupted)
{
[self teardownAudio];
}
return YES;
}
- (BOOL)isCapturing
{
return recording;
}
- (uint16_t)estimatedRenderDelay
{
return _playoutDelay;
}
- (uint16_t)estimatedCaptureDelay
{
return _recordingDelay;
}
#pragma mark - AudioSession Setup
static void print_error(const char* error, OSStatus code) {
char result_string[5];
UInt32 result = CFSwapInt32HostToBig (code);
bcopy (&result, result_string, 4);
result_string[4] = '\0';
NSLog(@"ERROR[OpenTok]:Audio deivce error: %s error: %4.4s",
error, (char*) &result_string);
}
- (void)disposePlayGraph
{
if (au_play_graph) {
DisposeAUGraph(au_play_graph);
au_play_graph = NULL;
}
}
- (void)disposeRecordGraph
{
if (au_record_graph) {
DisposeAUGraph(au_record_graph);
au_record_graph = NULL;
}
}
- (void) teardownAudio
{
[self disposePlayGraph];
[self disposeRecordGraph];
[self freeupAudioBuffers];
AVAudioSession *mySession = [AVAudioSession sharedInstance];
[mySession setCategory:avAudioSessionCatigory error:nil];
[mySession setMode:avAudioSessionMode error:nil];
[mySession setPreferredSampleRate: avAudioSessionPreffSampleRate
error: nil];
[mySession setPreferredInputNumberOfChannels:avAudioSessionChannels
error:nil];
isAudioSessionSetup = NO;
}
- (void)freeupAudioBuffers
{
if (buffer_list && buffer_list->mBuffers[0].mData) {
free(buffer_list->mBuffers[0].mData);
buffer_list->mBuffers[0].mData = NULL;
}
if (buffer_list) {
free(buffer_list);
buffer_list = NULL;
buffer_list_size = 0;
}
}
- (void) setupAudioSession
{
AVAudioSession *mySession = [AVAudioSession sharedInstance];
avAudioSessionCatigory = mySession.category;
avAudioSessionMode = mySession.mode;
avAudioSessionPreffSampleRate = mySession.preferredSampleRate;
avAudioSessionChannels = mySession.inputNumberOfChannels;
if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"7.0")) {
[mySession setMode:AVAudioSessionModeVideoChat error:nil];
}
else {
[mySession setMode:AVAudioSessionModeVoiceChat error:nil];
}
[mySession setPreferredSampleRate: kSampleRate error: nil];
[mySession setPreferredInputNumberOfChannels:1 error:nil];
[mySession setCategory:AVAudioSessionCategoryPlayAndRecord
withOptions:AVAudioSessionCategoryOptionMixWithOthers error:nil];
[self setupListenerBlocks];
NSError *err;
[mySession setActive:YES error:&err];
}
- (BOOL) setupAudioForGraph:(AUGraph *)au_graph playout:(BOOL)isPlayout
{
OSStatus result = noErr;
if (*au_graph) { return YES; }
mach_timebase_info(&info);
if (!isAudioSessionSetup)
{
[self setupAudioSession];
isAudioSessionSetup = YES;
}
UInt32 bytesPerSample = sizeof(SInt16);
stream_format.mFormatID = kAudioFormatLinearPCM;
stream_format.mFormatFlags =
kLinearPCMFormatFlagIsSignedInteger | kAudioFormatFlagIsPacked;
stream_format.mBytesPerPacket = bytesPerSample;
stream_format.mFramesPerPacket = 1;
stream_format.mBytesPerFrame = bytesPerSample;
stream_format.mChannelsPerFrame= 1;
stream_format.mBitsPerChannel = 8 * bytesPerSample;
stream_format.mSampleRate = (Float64) _audioFormat.sampleRate;
result = NewAUGraph(au_graph);
if (noErr != result) {NSLog(@"Error creating AUGraph"); return NO;}
AudioComponentDescription io_dec;
io_dec.componentType = kAudioUnitType_Output;
io_dec.componentSubType = kAudioUnitSubType_VoiceProcessingIO;
io_dec.componentManufacturer = kAudioUnitManufacturer_Apple;
io_dec.componentFlags = 0;
io_dec.componentFlagsMask = 0;
// Multichannel mixer unit
AudioComponentDescription mixer_desc;
mixer_desc.componentType = kAudioUnitType_Mixer;
mixer_desc.componentSubType = kAudioUnitSubType_MultiChannelMixer;
mixer_desc.componentManufacturer = kAudioUnitManufacturer_Apple;
mixer_desc.componentFlags = 0;
mixer_desc.componentFlagsMask = 0;
AUNode io_node; // node for I/O unit
AUNode mixer_node; // node for Multichannel Mixer unit
// Add the nodes to the audio processing graph
result = AUGraphAddNode (*au_graph, &io_dec, &io_node);
if (noErr != result) {
print_error("AUGraphNewNode failed for I/O unit", result);
return NO;
}
result = AUGraphAddNode (*au_graph, &mixer_desc, &mixer_node);
if (noErr != result) {
print_error("AUGraphNewNode failed for Mixer unit", result);
return NO;
}
result = AUGraphOpen(*au_graph);
if (noErr != result) {
print_error("AUGraphOpen", result);
return NO;
}
AudioUnit mixer_unit;
AudioUnit voice_unit;
result = AUGraphNodeInfo(*au_graph,
mixer_node,
NULL,
&mixer_unit);
if (noErr != result) {
print_error("AUGraphNodeInfo", result);
return NO;
}
result = AUGraphNodeInfo(*au_graph,
io_node,
NULL,
&voice_unit);
if (noErr != result) {
print_error("AUGraphNodeInfo", result);
return NO;
}
Float64 f64 = 0;
UInt32 size = sizeof(f64);
OSStatus latency_result = AudioUnitGetProperty(voice_unit,
kAudioUnitProperty_Latency,
kAudioUnitScope_Global,
0, &f64, &size);
UInt32 flag = 1;
if (!isPlayout)
{
recording_voice_unit = voice_unit;
result = AudioUnitSetProperty(voice_unit,
kAudioOutputUnitProperty_EnableIO,
kAudioUnitScope_Input,
kInputBus,
&flag,
sizeof (flag));
if (noErr != result) {
print_error("AudioUnitSetProperty Enable Input", result);
return NO;
}
if (0 == latency_result)
{
_recording_AudioUnitProperty_Latency = f64;
}
else
{
_recording_AudioUnitProperty_Latency = 0;
}
} else
{
playout_voice_unit = voice_unit;
result = AudioUnitSetProperty(voice_unit,
kAudioOutputUnitProperty_EnableIO,
kAudioUnitScope_Output,
kOutputBus,
&flag,
sizeof (flag));
if (noErr != result) {
print_error("AudioUnitSetProperty Enable Output", result);
return NO;
}
if (0 == latency_result)
{
_playout_AudioUnitProperty_Latency = f64;
}
else
{
_playout_AudioUnitProperty_Latency = 0;
}
}
result = AudioUnitSetProperty(voice_unit,
kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Output,
kInputBus,
&stream_format,
sizeof (stream_format));
if (noErr != result) {
print_error("AudioUnitSetProperty Set Format", result);
return NO;
}
result = AudioUnitSetProperty(mixer_unit,
kAudioUnitProperty_ElementCount,
kAudioUnitScope_Input,
0,
&kMixerBusCount,
sizeof (kMixerBusCount));
if (noErr != result) {
print_error("AudioUnitSetProperty Set Mixer Buss Count", result);
return NO;
}
UInt32 maximumFramesPerSlice = 640;
result = AudioUnitSetProperty(mixer_unit,
kAudioUnitProperty_MaximumFramesPerSlice,
kAudioUnitScope_Global,
0,
&maximumFramesPerSlice,
sizeof (maximumFramesPerSlice));
if (noErr != result) {
print_error("AudioUnitSetProperty Set Mixer Frames Per Slice", result);
return NO;
}
UInt16 bus_num = kMixerStreamInStart;
for (; bus_num < kMixerBusCount; ++bus_num) {
if (isPlayout)
{
AURenderCallbackStruct input_cb;
input_cb.inputProc = &playout_cb;
input_cb.inputProcRefCon = (__bridge void *)(self);
result = AUGraphSetNodeInputCallback(*au_graph,
mixer_node,
bus_num,
&input_cb);
if (noErr != result) {
print_error("AUGraphSetNodeInputCallback", result);
return NO;
}
}
result = AudioUnitSetParameter(mixer_unit,
kMultiChannelMixerParam_Enable,
kAudioUnitScope_Input,
bus_num,
1,
0);
}
if (!isPlayout)
{
AudioUnitParameterValue is_off = 0;
result = AudioUnitSetParameter(mixer_unit,
kMultiChannelMixerParam_Enable,
kAudioUnitScope_Input,
kMicBus,
is_off,
0);
if (noErr != result) {
print_error("AudioUnitSetParameter (enable the mixer unit)",
result);
return NO;
}
AURenderCallbackStruct output_cb;
output_cb.inputProc = recording_cb;
output_cb.inputProcRefCon = (__bridge void *)(self);
result = AUGraphSetNodeInputCallback (*au_graph,
mixer_node,
kMicBus,
&output_cb);
if (noErr != result) {
print_error("AudioUnitSetProperty callback setup",
result);
return NO;
}
}
UInt16 busNumber = kMixerStreamInStart;
for (; busNumber < kMixerBusCount; ++busNumber) {
result = AudioUnitSetProperty(mixer_unit,
kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Input,
busNumber,
&stream_format,
sizeof (stream_format));
if (noErr != result) {
print_error("AudioUnitSetParameter (enable the mixer unit)",
result);
return NO;
}
}
if (!isPlayout)
{
result = AudioUnitSetProperty(mixer_unit,
kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Input,
kMicBus,
&stream_format,
sizeof (stream_format));
if (noErr != result) {
print_error("AudioUnitSetProperty (set mixer unit input stream "
"format)",
result);
return NO;
}
}
Float64 sample_rate = _audioFormat.sampleRate;
result = AudioUnitSetProperty(mixer_unit,
kAudioUnitProperty_SampleRate,
kAudioUnitScope_Output,
0,
&sample_rate,
sizeof (Float64));
if (noErr != result) {
print_error("AudioUnitSetProperty (set mixer output stream format)",
result);
return NO;
}
result = AudioUnitSetProperty(mixer_unit,
kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Output,
0,
&stream_format,
sizeof (stream_format));
if (noErr != result) {
print_error
("AudioUnitSetProperty (set mixer unit output stream format)", result);
return NO;
}
result = AUGraphConnectNodeInput(*au_graph,
mixer_node,
0,
io_node,
0);
if (noErr != result) {
print_error("AUGraphConnectNodeInput", result);
return NO;
}
#ifdef DEBUG
CAShow (*au_graph);
#endif
result = AUGraphInitialize(*au_graph);
if (noErr != result) {
print_error("AUGraphInitialize", result);
return NO;
}
return YES;
}
- (void) onInterruptionEvent: (NSNotification *) notification
{
NSDictionary *interruptionDict = notification.userInfo;
NSInteger interruptionType =
[[interruptionDict valueForKey:AVAudioSessionInterruptionTypeKey]
integerValue];
switch (interruptionType) {
case AVAudioSessionInterruptionTypeBegan:
{
if(recording)
{
isRecorderInterrupted = YES;
[self stopCapture];
}
if(playing)
{
isPlayerInterrupted = YES;
[self stopRendering];
}
}
break;
case AVAudioSessionInterruptionTypeEnded:
{
// Reconfigure audio session with highest priority device
[self configureAudioSessionWithDesiredAudioRoute:
AUDIO_DEVICE_BLUETOOTH];
if(isRecorderInterrupted)
{
isRecorderInterrupted = NO;
[self startCapture];
}
if(isPlayerInterrupted)
{
isPlayerInterrupted = NO;
[self startRendering];
}
}
break;
default:
NSLog(@"Audio Session Interruption Notification"
" case default.");
break;
}
}
- (void) onRouteChangeEvent: (NSNotification *) notification
{
NSDictionary *interruptionDict = notification.userInfo;
NSInteger routeChangeReason =
[[interruptionDict valueForKey:AVAudioSessionRouteChangeReasonKey]
integerValue];
switch (routeChangeReason) {
case AVAudioSessionRouteChangeReasonUnknown:
break;
case AVAudioSessionRouteChangeReasonNewDeviceAvailable:
break;
case AVAudioSessionRouteChangeReasonOldDeviceUnavailable:
break;
case AVAudioSessionRouteChangeReasonCategoryChange:
break;
case AVAudioSessionRouteChangeReasonOverride:
break;
case AVAudioSessionRouteChangeReasonWakeFromSleep:
break;
case AVAudioSessionRouteChangeReasonNoSuitableRouteForCategory:
break;
default:
break;
}
}
- (void) setupListenerBlocks
{
if(!areListenerBlocksSetup)
{
NSNotificationCenter *center = [NSNotificationCenter defaultCenter];
[center addObserver:self
selector:@selector(onInterruptionEvent:)
name:AVAudioSessionInterruptionNotification object:nil];
[center addObserver:self
selector:@selector(onRouteChangeEvent:)
name:AVAudioSessionRouteChangeNotification object:nil];
areListenerBlocksSetup = YES;
}
}
- (void) removeObservers
{
NSNotificationCenter *center = [NSNotificationCenter defaultCenter];
[center removeObserver:self];
areListenerBlocksSetup = NO;
}
static void CheckError(OSStatus error, const char *operation) {
if (error == noErr) return;
char errorString[20] = {};
//check fourcc code
*(UInt32*)(errorString + 1) = CFSwapInt32HostToBig(error);
if (isprint(errorString[1]) && isprint(errorString[2]) &&
isprint(errorString[3]) && isprint(errorString[4]))
{
errorString[0] = errorString[5] = '\'';
errorString[6] = '\0';
}
else {
//sprintf(errorString, "%d", (int)error);
}
//fprintf(stderr, "Error: %s (%s)\n", operation, errorString);
}
static void update_recording_delay(OTDefaultAudioDevice* device) {
device->_recordingDelayMeasurementCounter++;
if (device->_recordingDelayMeasurementCounter >= 100) {
// Update HW and OS delay every second, unlikely to change
device->_recordingDelayHWAndOS = 0;
// HW input latency
AVAudioSession *mySession = [AVAudioSession sharedInstance];
// HW output latency
NSTimeInterval interval = [mySession outputLatency];
device->_recordingDelayHWAndOS += (int)(interval * 1000000);
// HW buffer duration
interval = [mySession IOBufferDuration];
device->_recordingDelayHWAndOS += (int)(interval * 1000000);
device->_recordingDelayHWAndOS += (int)(device->_recording_AudioUnitProperty_Latency * 1000000);
// To ms
device->_recordingDelayHWAndOS =
(device->_recordingDelayHWAndOS - 500) / 1000;
// Reset counter
device->_recordingDelayMeasurementCounter = 0;
}
device->_recordingDelay = device->_recordingDelayHWAndOS;
}
static OSStatus recording_cb(void *ref_con,
AudioUnitRenderActionFlags *action_flags,
const AudioTimeStamp *time_stamp,
UInt32 bus_num,
UInt32 num_frames,
AudioBufferList *data)
{
OTDefaultAudioDevice *dev = (__bridge OTDefaultAudioDevice*) ref_con;
if (!dev->buffer_list || num_frames > dev->buffer_list_size)
{
if (dev->buffer_list) {
free(dev->buffer_list->mBuffers[0].mData);
free(dev->buffer_list);
}
dev->buffer_list =
(AudioBufferList*)malloc(sizeof(AudioBufferList) + sizeof(AudioBuffer));
dev->buffer_list->mNumberBuffers = 1;
dev->buffer_list->mBuffers[0].mNumberChannels = 1;
dev->buffer_list->mBuffers[0].mDataByteSize = num_frames*sizeof(UInt16);
dev->buffer_list->mBuffers[0].mData = malloc(num_frames*sizeof(UInt16));
dev->buffer_list_size = num_frames;
}
OSStatus status;
uint64_t time = time_stamp->mHostTime;
/* Convert to nanoseconds */
time *= info.numer;
time /= info.denom;
status = AudioUnitRender(dev->recording_voice_unit,
action_flags,
time_stamp,
1,
num_frames,
dev->buffer_list);
if (status != noErr) {
CheckError(status, "AudioUnitRender Failed");
}
if (dev->recording) {
// Some sample code to generate a sine wave instead of use the mic
// static double startingFrameCount = 0;
// double j = startingFrameCount;
// double cycleLength = kSampleRate. / 880.0;
// int frame = 0;
// for (frame = 0; frame < num_frames; ++frame)
// {
// int16_t* data = (int16_t*)dev->buffer_list->mBuffers[0].mData;
// Float32 sample = (Float32)sin (2 * M_PI * (j / cycleLength));
// (data)[frame] = (sample * 32767.0f);
// j += 1.0;
// if (j > cycleLength)
// j -= cycleLength;
// }
// startingFrameCount = j;
[dev->_audioBus writeCaptureData:dev->buffer_list->mBuffers[0].mData
numberOfSamples:num_frames];
}
update_recording_delay(dev);
return noErr;
}
static void update_playout_delay(OTDefaultAudioDevice* device) {
device->_playoutDelayMeasurementCounter++;
if (device->_playoutDelayMeasurementCounter >= 100) {
// Update HW and OS delay every second, unlikely to change
device->_playoutDelay = 0;
AVAudioSession *mySession = [AVAudioSession sharedInstance];
// HW output latency
NSTimeInterval interval = [mySession outputLatency];
device->_playoutDelay += (int)(interval * 1000000);
// HW buffer duration
interval = [mySession IOBufferDuration];
device->_playoutDelay += (int)(interval * 1000000);
device->_playoutDelay += (int)(device->_playout_AudioUnitProperty_Latency * 1000000);
// To ms
device->_playoutDelay = (device->_playoutDelay - 500) / 1000;
// Reset counter
device->_playoutDelayMeasurementCounter = 0;
}
}
static OSStatus playout_cb(void *ref_con,
AudioUnitRenderActionFlags *action_flags,
const AudioTimeStamp *time_stamp,
UInt32 bus_num,
UInt32 num_frames,
AudioBufferList *buffer_list)
{
OTDefaultAudioDevice *dev = (__bridge OTDefaultAudioDevice*) ref_con;
if (!dev->playing) { return 0; }
uint32_t count = 0;
if(dev->playout_muted)
{
void *tempData = NULL;
uint32_t tempNumFrames = 0;
count = [dev->_audioBus readRenderData:tempData
numberOfSamples:tempNumFrames];